A box that has a weight of 40 cap n is hung from a spring. The spring constant of the spring is 400 cap n over m How many centimeters will the spring stretch?

Use Hooke’s law: the stretch is the force divided by the spring constant. With a weight of 40 N and a spring constant of 400 N/m, the stretch is 40 ÷ 400 = 0.1 m. Since 0.1 m equals 10 centimeters, the spring stretches 10 centimeters.

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